My Trailblazer check engine light is on

ANONYMOUS

2004 CHEVROLET TRAILBLAZER

168 MILES

My trailblazer check engine light is on. It flashes every time I feed the car gas. Its back firing bad. Its knocking as well. Also I when I change the spark plugs oil was on the bottom of my spark plug. What in the world is wrong with my vehicle?

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Tuesday, February 5th, 2013 AT 11:12 PM

1 Reply

ASEMASTER6371

EXPERT

25,509 POSTS

What is the code?

The oil may be from the tube the plug is in, not in the cylinder. The valve cover gasket will resolve that.